Metalworking machine



June 8, 1937. 5, BROWN AL 2,083,312

METALWORKING MACHINE Original Filed July 1, 1931 12 Sheets-Sheet 1INVENTCR S ROBE'RT 5 BROWN Sell/AM 8 R672 ATTORNEYS 12 SheetsPSheet 2 My7 r 2 d w 1 m ill! June 8, 1937. R. s. BROWN ET AL METALWORKING MACH INEOriginal Filed July 1, 1951 June 8, 1937. R. 5. BROWN ET AL 2,083,312

lNVENTORS 'RUBERT 5? BROWN Mg/LL/AM B. RETZ A TORNEYS June 8, 1937. R.s. BROWN El AL 2,033,312

METALWORKING MACHINE Original Filed July 1, 1951 12 Sheets-Sheet 4 O 1:'QY\

INVENTORS ROBERT S. B'ROWN ggLL/AM 8. RE 7 Z ATTORN Y J 1931. R. s.BRGWN ET AL 2,083,312

INVENTORS P065975. mw/v WLL/ M A foRNEYs June 8, 1937. R, 5, B WN ET AL2,083,312

METALWORKI NG MACHINE Original Filed July 1, 1931 12 Sheets-Sheet 6INVENTORS ROBERT 5. BR WN gZLLIAM 6 RETZ ATTC RN EYS June 8, 1937. R. 5.BROWN ET AL 2,083,312

METALWORKING MACHINE Original Filed July 1, 1931 12 shets-sheet 7INVENTORS ROBERT S. 390W ATTO RQY June 8, 1937. R. s. BROWN ET AL2,083,312

METALWORKING MACHINE Original Filed July 1, 1931 12 Sheets-Sheet 8INVENTORS Reef/P1 s. 8R0 WN w /u MM 8. R572 ATTORN YS June 8, 1937. R.5. BROWN ET AL 2,083,312

METALWORKING MACHINE Original Filed July 1, 1931 12 Sheets-Sheet 9\xxmxxxixxxgyxfi WILLIAM 8.2572

ATTORNEYS June 8, 1937. R. s. BROWN ET AL 2,033,312

METALWORKING MACHINE Original Filed July 1, 1931 12 Sheets-Sheet 10INVENTORS RDBE'RTSBROWN WILLIAM B. RgTZ BY I g R. 5. BROWN ET AL,083,312

METALWORKING MACHINE June 8, 1937.

Original Filed July 1, 1931 '12 Shets-Sheet 11 INVENTOR s ROBERT s.BRQW/V 4/{LL/AM BRETZ ATTORNE s June 8, 1937. s, BRQWN AL 2,083,312

METALWORKING MACHINE SOLENOID /Z41 2&5

Patented June 8, 1937 UNITED STATES PATENT OFFICE assignments, to TheNew Britain Machine Company, New Britain, Conn., a corporation ofConnecticut Original application July 1, 1981, Serial No.

Divided and this application January 8, 1936, Serial No. 58,132

19 Claims.

Our invention relates to a metal working machine and will be describedas embodied in a multiple spindle automatic chucking machine of the workrotating type.

This application is a division of application Serial No. 548,098, filedJuly 1, 1931.

It is the general object of the invention to provide a machine of thecharacter indicated having improved structural and functional features,with a view to producing a high production machine,

which is sturdy, having a high degree of flexibility and safety inoperation.

A further object of importance is to provide an automatic work feed ormagazine feed arrange- 1 ment having various safety features so as toavoid injury to parts of the machine and which is rapid and accurate inoperation.

It is another object to provide a novel mechanism for automaticallyrendering the feed works inoperative upon an abnormal functioning ofparts of the machine, and incidentally in connection therewith, signalmeans for indicating normal as well as abnormal functioning.

Other objects and features of the invention will either be pointed outor will become apparent upon a reading of the specification inconnection with the drawings.

Briefly stated, the machine selected for embodiment of the inventionincludes a frame having a spindle carrier or turret indexibly mountedthereon and carrying a plurality of spindles. Each spindle is providedwith chucking mechanism, which, in the preferred form, is automaticallyactuated at the loading station. The turret is rigidly held against endmovement by an improved form of key or abutment mechanism, permittingfree indexing but serving to rigidly hold the turret against endmovement. The turret may be locked as usual by a locking bolt and may beclamped by a suitable clamping band associated with the turret in anovel manner. Extending from the turret is a tool slide guide upon whicha tool slide is movably mounted. The tool slide may be actuated by adraw rod extending through the turret, and the drive for the spindles ispreferably concentrically arranged relatively to the draw rod, and theparts are so related as to save space and provide a compact machine. Thetool slide may be adjusted on the draw rod with ease and nicety by meansof an improved adjustment which is provided. The chuck actuating devicesmay be very readily assembled and disassembled from the end of themachine, and there is a safety device to prevent accidental throwing inof the feed works while parts are in position for assembly anddisassembly. In connection with the form of chucking mechanism hereindisclosed, we provide a safety device to prevent injury to the chuckupon an abnormal movement of a chucking rod which is employed in thepreferred form. The chucking is preferably automatically accomplished bycam means.

A magazine feed arrangement for automatically feeding work-pieces is soarranged as to pick up a rough work-piece from the magazine and tosimultaneously remove a finished workpiece from a chuck in loadingposition. The transfer member is then moved so as to place the roughwork-piece in the chuck and to simultaneously move the finishedwork-piece to a stripper from which the finished work-piece is removedto a suitable receptacle. The simultaneous functions performed by thetransfer mechanism provides for accomplishment of all of the workfeeding functions in substantially half of the time required by atransfer device which must perform the functions above notedsuccessively rather than simultaneously. The magazine feed and transferarrangement is so arranged as to minimize the danger of injury to any ofthe parts upon any abnormal functioning. Improved means preferably inthe form of electrical contact means have been provided and arranged sothat upon an abnormal functioning of the work feeding means, the feedworks will be thrown out, whereas, upon a normal functioning, themachine is designed to operate automatically and the operator need donothing more than keep the magazine filled with rough workpieces. Asingle operator may therefore take care of the requirements of severalmachines. Upon an abnormal functioning, we preferably provide signal ortelltale devices, such as a red light, to indicate a throwing out of thefeed works, and we may also provide a signal mechanism, such as a greenlight, to indicate the normal and desired functioning of the machine.

In the drawings which show, for illustrative purposes only, a preferredform of the invention embodied in a multiple spindle automatic chuckingmachine- Fig. 1 is a view in front elevation of the lefthand portion ofthe machine;

Fig. 2 is a similar view of the middle portion of the machine and issubstantially a continuation of Fig. 1;

Fig. 3 is a similar view of the right-hand portion of the machine and issubstantially a contlnuation of Fig. 2;

Fig. 4 is a right-hand end view of the machine illustrated in Figs. 1,2, and 8, parts such as cross slides being omitted;

Fig. ii is an enlarged sectional view through the spindle carrier orturret and illustrating improved means for holding the turret againstend movement and improved spindle carrier clamping means;

Fig. 6 is a fragmentary view from the rear of the machine of the spindlecarrier and one spindle and chucking devices. together with adevelopment of the spindle drive gearing:

Fig. 7 is a development view of a feed gearing and is substantially acontinuation of the bottom of the gearing shown in Fig. 6;

Fig. 8 is a fragmentary sectional view from the rear of the machine of atool slide and tool slide guide and illustrating an improved adjustmentof the tool slide on its actuating rod:

Fig. 9 is an end view in elevation of a. transfer mechanism and parts ofan endless chain feed arrangement for work-pieces;

Figs. 10 and 10a are sectional views on an enlarged scale takensubstantially in the plane of the line Ill-ll of=Flg. 2 and illustratetransfer mechanism and means for moving the same, Fig. 10a being acontinuation of Fig. 10:

Fig. 11 is an end view in elevation of the left- 4 hand end of themachine as shown in Fig. 1, parts being broken away to disclose interiorconstruction;

Fig. 12 is a view of parts shown in Fig. ll. but viewed at right anglesthereto, parts being broken away;

Fig. 13 is a sectional view of parts shown in Fig. 11;

Fig. 14 is a diagrammatic view illustrating the application of certainsafety and signal means for the machine.

The general features of the machine, together with certain improvements,will first be described, and then the magazine feed mechanism, togetherwith certain safety devices, will be taken up.

The machine, in general, comprises a sturdy frame 5 having the maindriving motor i mounted thereon. The turret or spindle carrier I isindexibly mounted in a substantially semi-circular bearing trough Q,whereby an extensive and very substantial bearing is provided over aconsiderable length of the spindle carrier and over approximately halfof its circumference (Fig. 5). In order to very satisfactorily resistend movement of the spindle carrier under tool pressures, we provide keyor abutment means intermediate the ends of the turret. As shown moreparticularly in Fig.5. one of the parts, such as the turret, is providedwith a circumferential groove 8, while the other part (in this case theframe) is provided with a segmental key member ill secured to the frameas by means of screws ll-ll and holding the same very rigidly therein.The key member ID is preferably 01' a width to flt quite snugly in thecircumferential groove 0, and when the tool pressures are.transmitted tothe spindle carrier, the key and groove arrangement forms a very secureand rigid support for the turret against endwlse movement, and thiswithout any outside plates or flanges.

The turret may be indexed in any suitable manner, such as by means of aGeneva or a gear mechanism (not shown). The turret may be locked inindexed positions as by means of a locking bolt I! (Fig. 2). which maybe spring a,css,sis

pressed in the locking direction by means of a lever II and springsll-lland which may be positively withdrawn by means of the cam i I.

In addition to the locking bolt l2, we preferably provide a clampingband or strap II which may lie in the upper portion of the groove 8,though, as shown particularly in Fig. 6, it need not fill the groove.The clamping band Ill is preferably held at one end by an adjustable rodl1, and a spring it may be provided for urging that end of the clampingband It upwardly. To the opposite end of the band it, an actuating ordraw rod II is secured. A heavy spring 2!) serves to urge the draw rodl8 downwardly, and thus the clamping band I6 is moved into clampingposition. The clamping band II is positively moved to unclamp the turretas by means of a cam II and lever 22 engaging the lower end of the rodll. Thus, the clamping band I6. is always moved into clamping positionby a substantially uniform and predetermined force by means of thespring 20, and wear of the parts will not substantially change theclamping force. The clamping band is positively moved to its unclampedposition. The upper or cap portion 13 of the frame serves as a cover forthe spindle carrier and is preferably free thereof.

As heretofore indicated, the spindle carrier 1 is provided with aplurality of rotatable spindles 24-24, which may be mounted on preloadedball bearings 2525 (Fig. 6). Each spindle carries at its forward end achuck designated generally 28. As illustrated, each chuck comprises ahousing or body 21 having a cam surface or cam surfaces 28 upon whichride chuck Jaws 28-29. It will be seen that upon a rearward movement,that is, toward the right in Fig. 6 of the jaws 29, the latter will bemoved radially outwardly so as to grip a work-piece, such as the bearingring 30, or other work-piece having a bore therein. In order to move thelaws 29 rearwardly to the gripping position, a stud ll having a head 32engages the Jaws and is slidably mounted in the body 21. The stud Ii ispreferably moved in the chucking direction by means of a draw rod 33 andheavy spring 84 as shown herein, but which chucking arrangement, bymeans of draw rod and spring and actuating means therefor, are claimedbroadly in Brown Patent, No. 1,887,621. granted November 15, 1932.

In order to move the draw rod 33 against the heavy chucking spring IIthere is provided a yoke device It to engage the rear of the spindle or,more properly, an anti-friction device carried thereby, and the yoke 36carries a push rod 36 in the form of a rack engaged by a pinion 31 onshaft 38 mounted in the frame. The shaft 38 is rotated (Fig. l) by meansof an external lever 39 and link 40 on an actuating slide II, which maybe actuated by a cam and lever arrangement 42-, as shown. Thus, uponmovement of the slide II in one direction the pinion 31 will move thepush rod 38 toward the left as viewed in Fig. 6, so as to compress aspring 84 and move the stud Ii through the instrumentality of a spring44 which is interposed between the outside of a recessed head II and aflange 8 on the stud 3|. In the interior of the recessed head 45 is anabutment head l1, which is secured as by means of a screw connection llto the stud 3|. It will be seen that when the push rod 38 is released,as by movement of the slide II, in the direction opposite to that lastnoted, the draw rod 33 will be forced rearwardly by the spring 34, andthe shouldered head 41, being in engagement with aosasrs the shoulder ofthe recessed head 45, will draw the stud 33 rearwardly so as to forcethe chuck jaws 49 outwardly into gripping'position. Now, upon movementof the draw 'rod 33 toward the left, the recessed head 45 and spring 44will force the stud 3| toward the left, to release the chuck iaws 29.Should the draw rod 33 be given more movement than is required forreleasing the laws 29, the head 41 may simply move rearwardly in therecessed head 45 and no damage to any of the parts of the chuck willresult. In other words, the head 41 and recessed head 45 constitute alost motion connection operable in one direction, so that the requiredmovement of the draw rod 33 need not be so very accuratelypredetermined, and yet the jaws may be properly actuated.

In the form shown the spindle carrier 1 has centrally secured thereon asubstantial tool slide stem 50, which may have a tapered fit thereon(Fig. 6) and be secured, as by means of a nut ll, threaded onto the rearend of the stem and engageable with a shoulder on the spindle carrier.The opposite end of the tool slide guide 50, as shown in Figs. 3, 4 and8, is rotatably carried in a bearing 52 in the pedestal 53 on the frameof the machine. The tool slide 54 is slidable on the tool slide guideBI) and carries suitable tools, as will be understood. The tool slide 54is guided and held against rotation during its feeding and returnmovements by means of a rigid arm 55, fitting in a longitudinal guideway56 on the frame. The tool slide 54 is moved on its guide stem by meansof a draw rod 51, adjustably secured at one end to the tool slide or anextension 58 thereof. The draw rod 51 extends through the guide 50,which is suitably bored for that purpose and extends to the left-handend of the machine, where it is provided with a suitable cam follower59, to be actuated on a cam on the main feed cam drum Bli, as will beunderstood.

We have provided novel means for accurately adjusting the tool slide 54on the draw rod 51 and for securing the same in adjusted position. Inthe form shown the tool slide 54 or, rather, the tail extension 58thereof, is bored and counterbored to receive nuts "-82 to engageopposite sides thereof. These nuts tI-G! are both threaded onto the endof the draw rod 51. Each of the nuts is provided with devices, such asgear teeth 83, and the tail extension 88 is longitudinally bored, asindicated at 64, so that a wrench in the form of a pinion may be passedthereinto. By means of such a pinion wrench either or both of the nutsmay be engaged. With one of the nuts loosened up, both of the nuts maybe rotated simultaneously so as to adjust the tool slide and draw rod 51relatively to each other.

When the proper adjustment has been made one of the nuts may then beturned up so as to very securely hold the draw rod to the tool slide.One of the nuts in effect serves as a lock nut for the other, and bothnuts serve to eifect adjustment.

A part of the spindle drive arrangement is of novel form and is sorelated to the tool slide draw rod 51 as to provide a compact andconvenient arrangement. Fig. 6 shows more particularly the spindle driveworks. A chain from the driving motor 8 (Fig. 1) serves to drive thesprocket 85 (Fig. 6) secured to the main drive shaft 66. The small gears61 may be noted in passing as drive gears for a pump or pumps. The maindrive shaft 66 passes to the left and secured thereon is a pick oif gear88 meshing with a second pick off gear iii on a stub shaft. Pick of!gear 68 is keyed to the gear II which in turndrives the gear ll securedto the drive pinion II, which in turn drives the gear II. Gear II andpinion I! may be fixedly mounted on a sleeve surrounding shaft 66 andfree to rotate relatively thereto. By means of the pick off gears 8869,any desirable spindle speeds may be secured.

In order to secure a concentric compact drive for all of the spindles,we provide a drive sleeve 14 which may be mounted on an anti-frictionbearing 15 in the spindle carrier I. A rear portion of the sleeve may bemounted on an anti-friction bearing 16 in the frame web 11. The drivesleeve carries a gear 18 meshed with and driven by the gear 13 which isdriven by the pinion 12. The forward end of the sleeve 14 carriesanother gear 19 which is concentric with the spindle carrier and mesheswith each of the spindle drive gears 80. Each spindle drive gear may beclutched and unclutched as by means of a clutch 8| from the spindleitself, and, if desired, a suitable brake may be engaged with a brakespool 82. In a chucking machine, each spindle when it reaches theloading position is normally unclutched from its drive so that the chuckmay be loaded. The present concentric drive, however, may be employed ina screw machine. The novel driving arrangement including the drivesleeve 14 permits the passage of the draw rod 51 and may even act as aguide or support therefor if desired. The feed gear train is as follows:

During the normal feeding of the tools, the cam drive is from the drivepinion 12 (Fig. 6) to the drive gear 83 (Figs. 6 and '7). The drive gear83 is rigidly connected by means of a sleeve to the gear 84 which mesheswith a gear 85 keyed for rotation with a pick oiT gear 88. The gear 86meshes with a second pick off gear 81 which drives one portion of anoverrunning clutch 88, which in turn drives the gear 89 through theshaft 80. The gear 89 meshes with and drives the gear 8| carried by apart of the main feed clutch designated generally 92, When the main feedclutch is in as indicated in Fig. 7, the sleeve 93 and pinion 94 arerotated and the latter meshes with the gear 96 which in turn drives gear96. Gear 98, through the two gears 9198 and gear 99, drives the mainfeed cam 60. The above described drive is for the slow traverse orworking portion of the cam rotation.

An accelerated drive is provided for driving the cam shaft at a higherrate of speed during the drawback, jump of the tools, indexing, spindlecarrier locking, etc. The accelerated drive is from the main drivesprocket 6B and drive gear Ilii (Fig. 6), which latter drives the gear|0l on the accelerated shaft I02 (Fig. 7). The gear IIH drives through aclutch I03, which in turn drives the shaft 90 and drive gear 88. Thegear 89, by means of the gears 9|, clutch 92 and gears 84 to 89heretofore described, drives the main feed cam 80 at a rapid rate. Thisaccelerated drive is permitted without unclutching the other gearsheretofore described, because of the overrunning clutch 88, whichpermits the slow traverse gears to be driven in the usual manner andmerely permits the gear 89 to run ahead of the normal drive of the slowtraverse train. When the clutch I03 is out, the drive to the main feedcam ill is through the slow traverse, and when the clutch IIII is in,the drive is through the accelerated gears or fast traverse. When theclutch 9! is out, it will be clear that there can be no drive to themain feed cam. As is usual in machines of this type, the clutch Ill iscontrolled by suitable dogs (not shown) on the main cam or some partcoordinated therewith.

The main feed clutch 02 may be actuated manually by a handle Ill at thefront of the machine. or a handle I" at the rear of the machine. Boththe handles IlM-IIII are suitably connected to a shaft IIIB (Fig. '1) sothat movement of either handle serves to rotate the shaft lit. The shaftIII! may carry a crank Ill conneeted by a link Ill to the clutch shaftlever which may automatically render the hand cranklog mechanismoperative when the main feed clutch is thrown out. In the form shown,the gear 88, which drives the feed cam gear 98, is carried upon a pinionsleeve shaft H0, and a rod III is splined to the shaft as by means ofthe teeth or splines H2. One end of the rod III is connected to theclutch shaft lever III! so that when the latter is moved to throw theclutch in either direction, the rod III will be moved longitudinally andwill always be splined to the cam driving sleeve shaft IIB. There is ashort sleeve or bushing H3 mounted in the frame and which is providedwith teeth or parts I II for coaction with the spline parts II2 on therod III. A shaft H6 is rotatable with the bushing Ill, and, asillustrated, we have provided the shaft II! with splines or teeth IIBwhich mesh with the complementary parts III in the bushing III. A handcrank III is connected to the shaft III as by means of bevel gears Hi.It will be clear that with the main feed clutch 92 in the in" positionas shown in Fig. '7, the rod III is positioned at the right-hand limitof its movement, and the splines or teeth II2 are withdrawn from thesleeve or bushing I I2. However, when the clutch shift lever III isrotated so as to throw the clutch 92 out, the rod III is moved to theleft so that the teeth II2II4 mesh with each other, and upon rotation ofthe hand crank III, the rod III, and through it the cam driving sleeveshaft Illl, will be rotated so as to rotate the gear 98 for driving themain feed cam 60. Thus it is impossible to throw in the hand crankingmechanism while the power feed is on, and by the mere act of throwingout the power feed by means of the main feed clutch 92 the handcrankirrg mechanism becomes operative.

There are other safety devices in connection with the main power feedclutch to prevent throwing in of the latter under certain conditions, aswill be described. The machine is arranged so that a suitable bar orother tool may be inserted endwise to manually actuate the chucks invarious stations. As shown more par ticularly in Figs. 6, l1, and 12,the frame is provided with a plurality of apertures Ii8I2I-- I22I23 anda large aperture I24, each of these apertures being located in alignmentwith a spindle or chuck in various stations. These apertures arenormally covered by a shiftable cover or annular plate I25 rotatablyheld to the frame as by means of a central disk I2II secured by screwsI28. The cover or closure plate I25 is provided with means registeringwith the various apertures I I! to I24 when the cover plate is shiftedto one position. and when shifted to another position, the cover plateserves to cover those apertures. As illustrated. the closure plate II!has a large open notch I2! to register with the large apertures I24 inthe frame. and is provided with smaller apertures I2'II2i---Ill. Theclosure plate may be further provided with an extended open notch I3!which permits access to the aperture I2I when shifted to one position.The notch III further permits the location of other parts on the frame,as will be later described.

Thus it will be seen that with the closure I2I in the position indicatedin Figs. 6, 11 and 12. all of the frame apertures are covered. With thecover plate shifted clockwise, as viewed in Fig. 11, it will be seenthat all of the frame apertures will be uncovered so as to permit accessto the chuck actuating mechanisms. The various drive gears which may bein the way of a tool inserted through any of the frame apertures arepreferably provided with spaced apart spokes, so as to readily admit abar or other tool, as will be understood. The large aperture I2. is ofsufilcient size to permit removal or insertion of the chucking spring 34and actuating rod 33 and other assembled parts.

The frame and cover plate I25 may further be provided with registeringapertures I32II3, which are in registry with each other when theremaining openings in the frame and closure plate are out of registryand the frame openings therefore closed. Passing through the opening I22is a red I (Figs. 6, 11, which may be spring pressed inwardly by meansof a spring I85. The rod I34 extends within the frame and is located inthe path of a crank arm I36, carried by the shaft I86, which isoscillated for moving the main feed clutch 92. Thus, when the closureplate I2! is moved so as to uncover the frame openings II! to I24, theopenings I22 and In will be out of registry, and, by reason of the crankI26 and red I, it will be impossible to oscillate the shaft I" and themain feed clutch 82 cannot be thrown in. By the means just described itwill be clear that any tool inserted through the frame openings willhave to be withdrawn and the cover plate I25 shifted so as to close allthe frame openings before the main feed clutch can be thrown in. The rodI, as will be later described in connection with certain electricaldevices, is made use of for closing a normally open switch when theclutch is thrown out, so as to energize a signal device.

. Magazine feed We have devised an improved and very rapid method ofautomatically feeding work-pieces to the chucks and removing the sametherefrom. We have also devised certain safeguards and telltale devicesto prevent injury to the machine and to provide a check on itsoperation.

We may employ a magazine arrangement in the form of spaced platesISL-I31 carried on an endless chain running over sprockets carried atthe top of the frame. Beneath the lower run of the chain is a slidewaywhich, in the form shown, consists of a pair of bars Its-I39 so thatworkpieces such as bearing rings, for example, II may be placed by theoperator between adjacent spaced plates Ill-Ill and may rest on the tworods Iii-I38 and he slid therealong during movement of the chain. Aswill be later described, the chain is given a step by step movement soas to discharge a work-piece Ill at the proper time.

. .jes

1.1.1 1 the transfer arm shaft I46 is iournaled and slid- As shown best,in Figs. 4 and 9, the work-pieces, shown as bearing rings, are movedalong the guide rods Ill-I39, and when a work-piece reaches the properlocation it moves down by gravity to the position indicated in Fig. 4.In order to permit this action, the guide rod I39 terminates Just beforethe point at which it is desired to discharge a ring into a suitableholding device, and therefore when the ring passes beyond the end of therod III. it simply rolls or slides out from between its holding platesI31 and moves down the adjustable guide track I and into engagement witha second adjustable guide or stop I42 where it reposes as is indicatedparticularly in Fig. 4. The guides III-I42 are so positioned as to quiteaccurately locate the ring in any desired position to be picked up by atransfer device to be described.

In our preferred form, the transfer device is designed to pick up arough work-piece from the holding device ,I4II42, and at the same timepick out a finished work-piece from the chuck 26 in loading position andthen transfer the rough work-piece to the chuck 26 in loading positionand at the same time transfer the finished workpiece from the chuck itto a stripping device and thereafter move away to permit indexing of thespindle carrier. In the form illustrated. our transfer device includestwo transfer chucks I43-I44 carried by a transfer arm device I45 on arotatable and longitudinally slidable shaft I48 mounted in the frame.

The transfer chucks on the transfer arm I4! are spaced apart a distanceequal to the distance between the chuck 26 in the loading station andthe work piece hill (Fig. 4) the location of which for convenience weshall term the magazine. since the work positioning means is, in fact, apart of the magazine arrangement. The space between the transfer chucksI43-I44 is also equal to the distance between the chuck 26 in loadingstation and the stripping device. designated generally I59, and whichmay comprise a pair of spring pressed stripping jaws IUD-I (Figs. 2, 9and 10, having tapered noses IBI-IBI to be engaged by the work piece andhaving shoulders "2-48! to engage behind the work piece so that, uponwithdrawal of the transfer chuck, the work piece will be stripped andfall into a suitable hopper.

Movements of the transfer arm I45 and transfer chucks carried therebyconsist of a longitudinal movement inwardly to pick up a rough workpiece from the magazine and at the same time pick up a finished workpiece from the chuck in loading position. Transfer chucks are next movedoutwardly and then rotatably, so as to bring the rough work pieceopposite the chuck in loading position and the finished work pieceoppwite the stripping device. The transfer arm is then again movedlongitudinally inwardly so as to position the rough work piece in thechuck in loading position and the finished work piece in the stripper.The chuck is then closed automatically to grip the work piece thereinand the transfer chucks are then again moved longitudinally outwardly tostrip the finished work piece and leave the rough work piece in themachine chuck, after which the transfer device islagain rotated upwardlyto the initial position. These movements are accomplished as follows:As" shown particularly in F gs. 2, l0 and 10*,

fablfin spaced apart frame bearings Iii-Ill. The shaft I46 is movedtoward the right as 75 lnflthe drawings by positive means, such as thelever I45, having a nose I to engage a plug or button I61 secured in theend of the hollow shaft I. A link I44 is pivotally connected at one endof the lever I", and at the opposite end to a bell crank lever I",actuated in one direction by a cam III on the cam shaft. Thus, when thecam rocks the lever I89 so as to draw down on the link I", the nose ISOin engagement with the button in positively moves the shaft III to theright, that is, in the direction to move the transfer chucks away fromthe magazine and machine chuck. which movement. as stated, re moves arough work piece from the magazine and a finished work piece from themachine chuck. After the shaft I46 has been rotated by means to bedescribed the shaft I is moved toward the left, so as to position thework pieces carried by the transfer chucks in the machine chuck andstripper. This left-hand movement is preferably accomplished by springmeans, so as to avoid injury to parts in case anything goes wrong withthe machine.

In the form illustrated, a coil spring is located within the hollowshaft I46 and is sustained at one end by the button I61 and at the otherend by a plug I'll having a pin therethrough forming gudgeons I'll, heldin a ring III which may abut a part of the frame, as shown particularlyin Fig. 10. It will be clear that when the cam IIIl permits, the shaftI46 will be resiliently moved to the left by the compression spring I14and the link It! will be raised to the position of Fig. 2.

The shaft I46 carrying the transfer mechanism is rotated by means,preferably including a cam and springs acting against limit stops. Inthe form illustrated, the shaft I48 has a long faced pinion I15 securedthereon (Figs. 2 and 10) A rack bar I18 is slidably guided in a hearingI" on the frame and meshes with the pinion I15, so that upon movement ofthe rack bar I" the shaft I46 and parts carried thereby will be rotated.A groove cam I'll (Figs. 2 and 4) serves to reciprocate the rack bar I"through a connecting rod I19, and springs I8l-I8I preferably form partof the connecting means between the connecting rod I19 and the rack barI'll, as clearly appears in Fig. 2 and as will be understood. Needlessto say, the cams I10 and I'll are of such form and are so located as torotate the transfer arm and to move the same longitudinally at theproper times and in the proper sequence.

The operation of the transfer mechanism is as follows:

Assuming the transfer mechanism to be in the position indicated in Figs.2 and 4, it will be seen that the cam I I! has raised the connecting rodI19 and through the spring IOI has moved the rack bar I18 upwardly torotate the shaft I48, so as to bring one transfer chuck into alignmentwith the stripper mechanism I5! and the other transfer chuck intoalignment with the machine chuck It in the loading station. The springI14 in shaft I46 has served to rock the lever I and raise the link I" soas to permit the shaft I48 and consequently the transfer chucks to movetoward the left. that is. so as to convey the rough work-piece in thetransfer chuck I43 into the machine chuck 20 in loading station and tobring a finished work-piece from the machine chuck 28 into the stripperIN. The spring connection between the rack bar I" and the cam I18 hascaused the transfer arm to be resiliently moved, until a guide block I"(Fig. 9) contacted with the lower limit stop Ill adjustably secured onthe machine frame. As stated, the spacing of t transfer chucks on thearm is such that when the limit stop II: is engaged by the block I82,the work-pieces in the transfer chucks will be properly aligned with themachine chuck and the stripper.

Now upon movement of the cam I", the lever I68 will be rocked so as todraw the link I" downwardly and cause the nose I of the upper crank topositively shift the shaft I46 and transfer chucks toward the right,which movement serves to leave the finished work-piece in the stripperIt! and leave a rough work-piece in the chuck 25, it being understoodthat before this movement takes place the chuck 26 has beenautomatically closed by the means heretofore described. When thetransfer chucks are free of the machine chuck and stripper they are soheld free by a suitable dwell on cam Ill), and the cam I18 then acts todraw downwardly on the connecting rod I18 and through the springconnection I80 the rack bar I1! is moved downwardly, so as to rock theshaft I and the transfer arm I45 into the rotative position shown inFig. 9. which movement will bring the upper guide block I" intoengagement with the upper limit stop I" adiustabiy secured on the frame.The arm I4! is provided with a shorter guide block I84, which shortguide block permits the transfer arm I45 .to swing into the positionindicated in Fig. 9 when the shaft I48 is out the limit of its outmovement. While the arm I4! is thus held in the position shown In Fig. 9by the cam H8 and resilient connection heretofore described, the springII4 slides the shaft I48 inwardly and resiliently moves the transferchucks to the in position shown in Fig. 2. During this movement thelever I", link I IIII, and lever I are moved to the positions shown inFig. 2.

With the parts in the positions of Fig. 9 the transfer chuck I43 willpick up a rough work piece which has previously been dropped into themagazine positioning means I4II42 by means to be described, and thechuck I44 will at the same time pick up a finished work piece from themachine chuck 26 in loading position, which machine chuck is thenautomatically opened. During this in movement the transfer arm I4! isaccurately guided by the two upper guide blocks Ill-I84. which will bein engagement with opposite sides of the limit stop I", so as toaccurately guide the transfer arm. The cam IIII, through lever I69, linkI88 and lever I65, will then positively move the shaft I46 and transferarm to the right, so as to carry a rough work piece in the transferchuck I43 and a finished work piece in the transfer chuck I44. Duringthis longitudinal movement the short guide block I84 will pass beyondthe end of the upper limit stop I83, and thereafter the cam I18, throughthe means heretofore described, will again rock the shaft I46, to 'movethe transfer mechanism to the position indicated'in Fig. 4, after whichthe cam IIII again permits the coil spring I14 to resiliently move theshaft I48 to the in position, sons to deposit a rough work piece in themachine chuck and enter the finished work piece in the stripper, asheretofore described.

Thus, in the time ordinarily required for removing a finished. workpiece from the machine chuck and conducting the same to a stripper. ourtransfer mechanism in addition picks up a rough work piece and transfersthe same to the chuck. Considerable time is thus saved.

By the use of two transfer chucks instead of one, we not only save timebut assure greater positiveness of action. One chuck which transfersrough work pieces is of appropriate size and design to properly gripsurfaces on the rough work pieces, while the other chuck is ofappropriate size and design to properly grip finished or other surfaces,on the finished work pieces. Thus, with each chuck designed to performits single function, there will be greater certainty of action thanwhere one chuck must handle both rough and finished pieces.

The chain portion of the magazine feed mechanism is moved in proper timewith the transfer mechanism and is preferably moved by the same meansthat moves a part of the transfer mechanism. In the form shown (Figs. 2,9)

the shaft I" of the inner sprocket for the chain is provided with aratchet wheel I", to be engaged and rotated by a pawl Ill. The pawl ismounted upon a lever III, which connects to one end of a link I", theopposite end of which is connected to a bell crank lever I", which inturn is connected by means of a link Iii to the rack bar I18 heretoforedescribed. In order to determine the number of teeth on the ratchetwheel I86 to be picked up by the pawl Ill at each actuation thereof, wepreferably provide a knockoff plate ifltwhich may be pivotally mountedon the shaft I86 and adjustably held as by means of a pin and slotconnection I91 to the frame. The pawl IlI is provided with a pin I04which, during actuation of the lever I88, rides up on a cam surface I95on the plate I92, and thus causes the nose of the pawl to be withdrawnfrom the ratchet teeth and to prevent engagement of the nose of the pawlwith another ratchet tooth until, by reverse actuation of the lever I88,the pin I94 is disengaged from the cam surface I". Thus, by shifting theplate I92 and holding the same in adjusted position by means of the pinand slot connection I93, the pawl may be caused to pick up one, two,three or any desired number of teeth at each actuation. so as to cause anew work piece to be dropped into the magazine positioning arrangementI4I--I42 during each cycle. The magazine chain is thus actuated by therack bar I16, so that a new work piece is dropped into the magazinepositioning arrangement I4I-I42 at the time that the transfer arms arein their out position and during rotation of the transfer arm in adownward direction, so that, when the transfer arm is again moved to theupper position as shown in Fig. 9, a new work piece will have beenpreviously deposited and will be ready to be picked up by the transferchuck I43.

The resilient in movement of the transfer arm by the coil spring I14prevents injury to the parts which might be occasioned were suchmovement positive and work-pieces or the like should jam in the chuck ormagazine device. The resilient actuating means I8lII8I likewise preventsinjury to parts of the machine should there be any jamming action. andalso obviates the necessity for very accurate positioning or camming ofthe parts, since the transfer arm is moved up against limit stops. Thus,the same cams will take care of work pieces of different sizes anddifferent shapes and transfer chucks of different appropriate sizes,and. since the limit stops are adjustable, the transfer and magazinearrangements are exceedingly flexible.

In connection with the magazine loading device, we prefer to provideadditional safeguards and telltale devices for automatically stoppingthe machine as by throwing out the feed clutch and at the same timeproviding a signal to indicate that the feed clutch has been thrown outwhenever there is an abnormal action to the machine. We preferably alsoprovide signal means in the form of a light to indicate that the machineis operating normally. In the form shown, we provide means for throwingthe feed clutch in the event that the transfer chucks are prevented frommoving up to the magazine device and the machine chuck or stripper, orin the event that for any reason they do not move to the normal extent.We may likewise provide means for throwing out the feed clutch in casethe transfer chuck fails to pick up a w0rk-plece, which failure might bedue to a failure of the operator to load the magazine or to failure ofsome part of the machine preventing such pick up.

Referring particularly to the diagrammatic drawing of Fig. 14 and toFigs. 2, 9, l1, and 12, it will be seen that we provide a solenoid 200having a core piece 20I which periodically during normal operation ofthe machine is energized and serves to prevent the feed clutch frombeing thrown out. However, upon an abnormal operation of the machine,the solenoid 200 is not energized, and the feed clutch is thrown outmechanically. The main food cam 50, or any auxiliary cam synchronizedtherewith. is provided with one or more cam dogs 202. and in the path ofthese dogs is a cam roller 203 carried by a lever arm 204. The lever armin the form shown is on a sleeve 205 loosely mounted on the shaft I06between a fixed collar 200 and a fixed hub 20'! carrying a lever arm 208which is ultimately connected to a manual handle at the front of themachine, as will be described. It will be recalled that the shaft I05.as appears more clearly in Fig. 7, controls the position of the mainfeed clutch 92 so that upon oscillation of the shaft I06 that main feedclutch is thrown in or out. Splined to the sleeve2ll5 and slidablethereon is a sleeve or hub 209 which has means such as a pin 2l0 whichis in the path of an ear 2 on the hub 201, which, as stated. is fixed tothe shaft I00. A spring 2I2 normally holds the pin in the positionsshown in Figs. 12 and 13 so as to be in the path of the ear 2. It willtherefore be seen that with the pin engaged behind the ear 2| I, asshown when the cam roller 203 is engaged by a dog, such as 202, the arm2M and with it the sleeve 205 will be rocked in a clockwise direction asviewed in Fig. 12. This rocking will cause the pin behind the ear 2H torock the hub 201 and with it the shaft I05, which. as has beendescribed, will throw out the main feed clutch and the feed functions ofthe machine will be stopped until the clutch is again thrown inmanually. As indicated in Fig. 12, a coil spring 2I3 serves to urge thelever 204 into the position shown so as to position the roller 203 inthe path of the dogs such as 202, and each time a dog passes the roller,the arm 204 is rocked.

Now, when all parts of the machine are functioning properly, it is notdesired to have the main feed clutch thrown out each t me the lever 204is rocked by a dog 202, and the solenoid core 20i is made use of forwithdrawing the pin 2I0 frombehind the ear 2 so that rocking of the core20I inwardly, the shaft 2I5 will be rocked so as to rock the fork lever2I4 and withdraw the hub 209 and with it the pin out from behind the ear2 so that a rocking of the arm 204 by the dog 202 will have no effect onthe feed clutch. As soon as the solenoid is de-energized, as will belater described, the spring 2l2 again moves the hub 209 and pin 2 I0into the positions shown in Figs. 12 and 13 so that they are in positionfor clutch throwing.

The main feed clutch 92, in addition to being f1 movable by means of'themanual handle I05 at the rear of the machine, is movable by the handleI04 at the front of the machine through a link 2I8, rock lever 2I9, link220 and arm 208 on the hub 201. Thus, the main feed clutch may beactuated manually from either the front or rear of the machine and maybe automatically actuated by means of the pin and ear device heretoforedescribed.

The electrical causing the solenoid 200 to be energized are shown moreparticularly in Fig. 14. We may provide line wires 225-225 and the mainfeed switch 221. A step down transformer 228 acts to re duce thevoltage, and the low voltage current acts through a relay 229, for apurpose to be described. The link member I58 (Figs. 2, 14) which servesto positively move the transfer chucks outwardly, and which is itselfmoved upwardly by means of the coil spring I14 (Fig. 10) to resilientlymove the chuck and transfer chucks inwardly, is provided with a contact230 which is grounded through the machine. The machine frame carries aninsulated contact 23I to be engaged by the contact 230 when the link IE8is moved to its predetermined upper position by means of the spring I14,as described. The contact 23I is connected by a wire 232 to a contact233, which is engageahle by a movable contact 234, movable by a dog 235on what may be termed adistributor 236, forming a part of or movablewith the main cam shaft. When the contact 230 is moved into engagementwith the contact 23L there will be a flow from the ground connectionthrough contacts 23il-23I, line 232, contacts 233-434 (when closed),thence through line 231 to actuate the relay and close the relay switch238. When the relay switch 230 is thus closed, it will be clear thatline current may flow through line 225, solenoid line 239, through thesolenoid, then solenoid line 240, line 2 through the closed relay switch238, and finally back through main line 226. When the solenoid is thusenergized, the core 20I is drawn in and, as heretofore describedparticularly in connection with Figs. 12 and 13, the. pin H0 iswithdrawn from behind the ear 2i l, and rocking of the lever 204 by thedog 202 will have no effect on the main feed clutch.

If, for any reason, such as a jamming of parts, the rod IE8 is notraised by the spring I14 so as to close the contacts 230-23I, the relay229 will not be energized, and the solenoid will not withdraw the pin2I0 from behind the ear, and the feed clutch will be thrown out.

connections and devices for We preferably provide other safety devices,one of which is indicated particularly in Figs. 9 and 14. A movablecontact member 242 grounded to the frame is pivotally mounted thereon at243 and is spring pressed outwardly to the position shown in Figs. 9 and14. An insulated contact 244 is mounted on a spring arm 245 on the framein position to be engaged by the grounded contact 242. The contact 242is positioned in the path of movement of a work-piece in a transferchuck while the same is being transferred from the magazine positioningdevice i4ii42 down to the position to be entered in the main machinechuck. In other words, each time a rough work-piece from the magazine ismoved down by the transfer arm I45 it wipes along the contact 242 andcloses the contacts 242, 244, so that, as shown in Fig. 14, current mayflow from the grounded contact 242, contact 244, line 246, through therelay back to ground, so as to energize the relay and close relay switch238, which closing, as heretofore described, permits line current toflow through the solenoid for drawing the core in and withdrawing thepin 2i0 from behind the ear 2, thus preventing the feed clutch frombeing thrown out by the dog 202 on the main cam.

If a transfer chuck should come down empty from the magazine, whichmight be occasioned by the failure of an operator to place work piecesin the magazine chain arrangement or which might be occasioned by somefailure of the transfer chuck to pick up a rough work piece, whichlatter condition might entail difficulties in having work pieces ball upin the magazine positioning device or chuck, there would be no wiping ofthe contact 242, and the contacts 242, 244 would remain open and thesolenoid would not be energized as heretofore described. If the solenoidis not energized, the feed clutch will be thrown out by the meansheretofore described.

It will be clear from the diagrammatic showing of Fig. 14 that when thesolenoid is energized the green light will be on, thus indicating eachtime that the solenoid is energized that the machine is operatingnormally.

We may also provide a red light, which comes on when the solenoid is notenergized at the proper time and the main feed clutch is thrown out.Such means includes a switch 241, shown diagrammatically in Fig. 14 andshown more particularly in Figs. 11 and 12. This switch is normally openand comprises a fixed contact 248 and a movable contact 249. As has beenheretofore described in connection with Fig. 6, an arm I35 is fixed tothe shaft I06 and engages the end of the pin I34, which is springpressed rear wardly. When the shaft I06 is rocked clockwise as viewed inFig. 6, and counterclockwise as viewed in Fig. 12, so as to throw outthe main feed clutch, the outer end of the pin I34 passes through theopening I33 and engages the movable contact 249, so as to cause it toengage the fixed contact 248 and close the switch 241. Upon reference toFig. 14. it will be plain that when the switch 241 closes, the red lightwill come on and indicate that the main feed clutch has been thrown out.

It is to be noted that the dogs, such as 202, are so positioned on themain cam 60 that. during normal operation, the solenoid will beenergized Just prior to the time each dog 202 engages the roller 203,and preferably the solenoid remains energized until the dog 202 haspassed beyond the roller 202. The wiping contact of a workpiece on thecontact 242 is of relatively short duration and the solenoid remainsenergized during such wiping action. The time of engagement of thecontacts 230-23i is of considerable duration, and it is for that reasonthat we prefer to provide a so-called distributor 236. which closes thecontacts 234-235 just prior to the time that the dog 202 reaches theroller 203, and as soon as the dog 202 has passed beyond the roller 203,the cam member 235 on the distributor will permit the movable contact234 to move, so as to open the circuit and deenergize the solonoid,which thus avoids the waste and heating effect incident to maintainingthe solenoid enenergized for long periods.

It will be seen that if anything goes wrong with the functioning of themagazine feed arrangemcnt. the main feed clutch is thrown out and theoperator is provided with a signal to indicate that fact. As soon as thecondition which caused the throwing out of the main feed clutch isremedied, the latter may be thrown in manually and thereafter, so longas the machine operates normally, the solenoid will be energized atproper points in the cycle of the machine and the feed clutch will notagain be thrown out unless something else goes wrong.

From what has been disclosed it will be clear that we have provided astop mechanism for a machine tool which may be actuated to stop themachine or its feed functions in response to one or more selectedconditions or modes of action such as an improper functioning of thefeed mechanism, as disclosed in the preferred form shown. The clutch orother stop means is thrown at a predetermined time in the cycle of themachine by mechanical means timed with other functions of the machine,and the solenoid means is employed to set or position means so as tocause the clutch throwing mechanism to act at the proper time. Thus thesolenoid or motor means may be small since it is called upon to set thetrigger and need not be sufficiently powerful to itself throw theclutch. The solenoid means involves two forces, one the force of thesolenoid armature and the other the oppositely acting loading means suchas the spring. One of the forces (in the embodiment shown in the springforce) serves to set the trigger mechanism while the other force(solenoid armature in the embodiment shown) serves to render the clutchthrowing means inoperative. While the forces need not be applied asshown in the illustrative embodiment yet there are advantages inarranging the parts so that the solenoid armature force renders theclutch throwing means inoperative to throw the clutch, one advantagebeing that should the source of current to the solenoid fail the clutchwould be thrown soon thereafter, thus advising the attendant that themachine requires attention.

It will be understood. by those skilled in the art, that when themachine is set up the various means for effecting indexing, locking andclamping of the turret, tool slide movements. work feeding, chucking,unchucking, etc., will be arranged so as to function at the desiredtimes and in proper sequence during a cycle of the machine.

We have provided a machine having a considerable number of features ofnovelty, all looking toward accuracy and speed of production, as well asfacility of operation and simplicity. We have also provided safetydevices to guard against iniury to parts should anything go wrong withthe feeding of the work pieces.

